Quote:
Originally Posted by Atmos
I have personally found that it starts having an effect from 45-60 minutes before sunrise. Your best bet is simply to keep imaging and then remove the final sub (pushing time wise) if the background becomes too bright.
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agree. depends on how much haze there is, latitude and the filter bandwidth. With Ha, I have gained an extra 3/4 hour or so (I didn't measure exactly how much, just threw out the bright subs) by starting imaging as soon as the guider would work after dusk and then stopping around the end of twilight. I guess you should get roughly the same in the morning and it would be worth trying while the moon is low down. O3 will be more sensitive to skylight, but if you use PI it can adjust the stacking to account for noisy images as the sky brightens. Please let us know how you get on.